Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75a52c8f44f288e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 23:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ee5ca3e148ea9d25dc72e5075e1c7ca SHA-1: 0ffa9b84a9cc983dba8e906084877154574d8334 SHA-256: a75a52c8f44f288ebc461f6881774703ad7fd8907963ba3083fd75dac646ad25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of external URIs and the link farm nature strongly suggest the PDF's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=e+lucevan+le+stelle+pdf PDF link annotation
    • http://tensoinox.com/userfiles/files/22447907058.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/60054961894.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/86654494760.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb895414c---44241056110.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/nuxaxigolonobujemimuwiwi.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/79615613036.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/55248676292.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/44702060129.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/41509199461.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/sajudivabidogavoso.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49342451156.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/19207954924.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/pegazunaxogokated.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e2f30f1f2ebaf0cd693b2b1db8c09516/10254832488.pdfIn PDF document text
    • https://premium-house.uz/images/file/xipufupisepezurotali.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/tinuzifigozila.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/78558797012.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/10510743254.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/dovadutigafavelaz.pdfIn PDF document text
    • http://packturf.fr/files/wanotunexuxukukezew.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/47770082667.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/66500718541.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10448 bytes
SHA-256: ae91b364c784534eed8fbe6b37b3135794ea77fd9246c7fca09265fedd01e514
font_03_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_04_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 20052 bytes
SHA-256: 672cf1c071b63e15085e90496e0fc702486eec582477d0a368afe924c0af0a4c